. >> additional support has been provided by -- rosalyn p. walter. bernard and irene schwartz. sue and edgar walkenheim iii. the sheryl and phillip minstein family. and contributions to your pbs station from viewers like you. thank you. >>> welcome to the program, everyone. i'm christiane amanpour in london. washington is awash with bitter partisanship, as we know, from the confirmation of justice brett kavanaugh to the supreme court to the combative campaigns for november's midterm elections. congress has seen scandal, diatribes, and insults replaced with the distant dignity and debate. enter into this swamp a most unusual partnership. republican governor john kasich of ohio and democratic governor john hickenlooper of colorado, an elephant and a donkey, if you like, choosing to overcome animalistic rituals of current politics. they warn that only a return to bipartisan cooperation can lead to policy breakthroughs. the two governors join me to talk about the blueprints and open lessons they've crafted on issues from health care at home to international trade policy. governors,